Vance Boelter has been charged in the shootings of two Minnesota lawmakers and their spouses, and the FBI says that he visited the homes of multiple other elected officials the night he killed Minnesota Rep.

Vance Boelter is accused of posing as a police officer and fatally shooting former Democratic House Speaker Melissa Hortman and her husband, Mark, in their home early Saturday in the northern Minneapolis suburbs. Authorities say he also shot Sen. John Hoffman, a Democrat, and his wife, Yvette, at their home in a nearby neighborhood.

Investigators found a cowboy hat near the vehicle and were working to determine whether it belongs to Boelter.